Ruling over this special breed of Demi-human, she is exclusively targeted by Dwarves (led by the Dwarf Chieftain) who wanted to invade the island and take her captive. Taken underground and brutally beaten, she is discovered by Serge and Razzly, and she presents them with a Wisp Cape. She then asks them to leave.

If Serge had not rescued Razzly from the Pentapus in Hydra Marshes, Rosetta is still abducted by the Dwarves and beaten. Upon finding her, Serge learns her last dying wish is to restore the tree at the Island's center, one that produces a very rare flower and Razzly's seventh level tech. Her Another World counterpart warns Serge the wells on the island have dried up and that the Water Dragon have become extinct.

Rosetta is the Italian variant of the name Rose, a flower popular for its scarlet petals and fragrance. Several times, Rosetta expresses her dying wish to see the flowers at the center of the Island preserved, and her name may be an allusion to this. Alternatively, Rosetta resembles Rosette, a term in botany used to describe a natural arrangment of certain plant leaves. Dandelions and Aloe plants have this leaf arrangement.